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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It needs a valid checksum to be a valid ISBN-10.
wdym
it has 10 numbers
number: 1 2 3 4 5 1 2 3 4 5
index: 1 2 3 4 5 6 7 8 9 10
And how is that an issue?
"1234512345"
is not a valid ISBN-10 identifier.One of the basic tests for javascript, 1234512345, expects false instead of true.